Yes I saw this post, but that was pre-hotfix.
Here is the hotfix
"The guild perk "Have Group, Will Travel" no longer allows players to summon guild mates inside dungeons, raids, Battlegrounds, or Tol Barad when the battle is in progress. It will also not function while the player is on any transport."
So now thats out of the way, fly to the top of the zep like normal but sit on the top wing (like a sharks fin). It will fly away and you will be gltiched standing in the air. I used the summon as it was flying away.
Here is the spot
Here is the spot after my guildee fell to his death and the zep was gone.
Its nothing special but still funny to do. Enjoy!
Oh and its an exploit because blizz tried to fix it and you still can? lol